diff --git a/src/pcd.rs b/src/pcd.rs
index 2cb1cff..748f7e7 100644
--- a/src/pcd.rs
+++ b/src/pcd.rs
@@ -137,7 +137,10 @@ pub trait Pcd<'a>: Serialize + Deserialize<'a> {
             })
             .collect();
 
-        let merkle_tree = MerkleTree::<Sha256>::from_leaves(&leaves?);
+        let mut leaves = leaves?;
+        leaves.sort_unstable();
+
+        let merkle_tree = MerkleTree::<Sha256>::from_leaves(&leaves);
 
         Ok(merkle_tree)
     }